Identify the grammatically correct sentence.

Correct Answer: A

Rationale: The correct sentence is 'Which one do you want?' Choice A is grammatically correct as it forms a question using 'which' to inquire about a specific choice. Choices B, C, and D contain errors in phrasing or grammar. Choice B includes a misspelling of 'want,' choice C uses 'whose' incorrectly, and choice D incorrectly combines 'who' and 'is' without proper context.

Correct Answer: B

Rationale: In this sentence, the correct form is the gerund 'going' after the preposition 'to.' The gerund form is used after prepositions to indicate an action or state. Therefore, 'Going' is the correct choice to complete the sentence. Choice A ('Go') is incorrect because it is not the gerund form required after 'to.' Choice C ('Be going') is incorrect as it is not the standard form used in this context. Choice D ('Going to go') is redundant and unnecessarily wordy.

Correct Answer: B

Rationale: In this sentence, the word that best fits is 'warranted,' meaning that the symptoms did not justify or necessitate an emergency room visit. 'Desired' means wanted or wished for, 'Guaranteed' means assured, and 'Should have been' is not the appropriate phrase in this context. Therefore, 'warranted' is the correct choice for this question.

Correct Answer: A

Rationale: In this context, 'Envelopes' is the correct choice as it refers to the items (envelopes) that the mailperson is responsible for delivering. The other choices are incorrect: 'Mail' (Choice B) is too general and does not specify the items to be delivered, 'Block' (Choice C) is the location and does not make sense in the context of delivering mail, and 'Every' (Choice D) is an adjective that does not complete the sentence logically.

Correct Answer: A

Rationale: The correct answer is 'Was studying,' which is the past continuous form describing an action that was happening at a specific time in the past. Choice B, 'Didn't study,' is incorrect because it's in simple past tense, not the continuous form required by the context. Choice C, 'Studied hard,' is incorrect as it lacks the continuous aspect required by the context. Choice D, 'Would have studied,' is in the wrong tense; it is a hypothetical past action, not an action in progress in the past.